Impact of embedded Co nanoparticles on local magnetic properties of <i>L</i>1₀-FePt films

Hard-magnetic films with precisely tuned switching fields are of great interest for advanced magnetic microsystems. Here we report on the specific evolution semi-hard properties L 1 0 -FePt integrating a graded concentration soft cobalt nanomagnets. These nanocomposites prepared by combination MS-LECBD and e-beam evaporation techniques where 8 nm Co nanoparticles embedded various x atomic up to 50%, into Fe/Pt multilayers. A subsequent annealing allows us reach alloy chemical order FePt matrix conserving Co-rich nanometer-sized inclusions. The focus is put interplay between local microstructure coercive field through combinatorial approach that involves determinations composition, magnetization reversal from scanning magneto-optical Kerr effect element-specific spin orbital moments X-ray circular dichroism performed at Fe L-edges absorption. We show how nanostructuration changes coercivity, both effective evolve composition nanocomposite film.